Apparatus for holding an anchor in a mold



. Jan. 2, 1945. 7 SAFFERT 2,366,656

APPARATUS FOR HOLDING ANCHORS IN MOLDS Filed Au 8, 1941 Q p i NVENTOR A ORNEY Patented lan. 2,

- orries APPARATUS FOR HOLDING AN ANCHOR IN A MOLD George J. Saflert, New Minn.

Applicationhugust 8, 1941, Serial No. 406,020-

2 Claims.

My invention relates to an improvement in concrete slab anchoring device, and method of embedding thesame, where it is desired to provide an effective anchor for holding the slabs in position as a wall facing.

Cast stone or concrete slabs are often used for facing concrete and masonry walls of building structures. When the slabs are used as a facing for a concrete wall, an inner concrete form wall of anyusualtype is erected; and the slabs are secured in spaced parallel relation thereto to provide the outer form wall. The slabs are held in place by anchors which extend into the slabs,

connecting the slabs to the inner form wall. Concrete is poured between the inner form wall and the slabs, embedding'the anchors. Thus, when the concrete has set, the anchors are embedded both in the slabs and the wall body, firmly connecting the slabs and the concrete wall together.

Certain diiiiculties have arisen in the use of anchors connecting the slabs to the wall. The slabs aresubjected to greater, or quicker, changes of temperature than is the concrete wall. In the past, the slab anchors have sometimes been in the form of wire loops or metal strips which are embedded in the slabs and project therefrom. These wire loops or strips extend directly from the surface of the slabs into the concrete wall. Upon expansion and contraction of the slabs, relative movement between thewall and the slabs, tendin to weaken the anchor or to injure the slabs adjacent the anchor.

In order to permit limited movement between the slabs and the concrete wall, attempts have been made to place a resilient tube around the anchor strip or loop adjacent the slabs and extending into the wall body a short distance. Such resilient tubes permit slight relative movement between the slabs and the concrete wall body, the anchoring loops or strips flexing the resilient tubes to some extent. slow, costly, and somewhat uncertain. Th resilient tubes form a weak spot in the wall adjacent the anchors, tending to secure the anchor less effectively.

An object of the present invention lies in the provision of a means of permitting limited movement between the slabs and the'wall. An anchoring bolt or strip may be anchored firmly and permanently embedded in the wall body and project therefrom into engagement with the anchor embedded in the slab. Relative movement is i'erences in expansion and contraction.

Such a construction is When the slabs are used as a facing for masonry walls or other types of walls, less dimculty is experienced with expansion and contraction; but it is still extremely desirable to provide'an anchor which is embedded within the slab and which does not project from the surface thereof. Obviously, when the embedded anchor protrudes from the body of the slab, the slabs cannot be piled one upon the other, and must be held in spaced relation. The cost of shipping the slabs is accordingly increased when embedded anchors of the old type are employed. When the anchors do not protrude from the slab body, however, the slabs may be piled one upon the other without injury to the slabs or anchors.

A feature of the present invention lies in the manner of embedding the anchor within the slab. The anchor is preferably in the shape of a'substantially U-shaped. strip or rod provided with outwardly projecting end flanges. The closed end of the U-shaped strip or rod is designed to extend substantially flush with the rear surface of the slab, the sides of the U, and the end flanges thereupon, extending into the body of the slab. A pocket or recess is provided in the rear surface of the slab, between the sides of the U-shaped bracket or anchor, so thatthe closed end. of the 'forthin the following specification and claims.

. In the drawing forming a part of my specification: r

Figure 11s a perspective view of a small section of a concrete or cast stone slab illustrating the construction thereof.

Figure 2 is a rear elevation view'of a section of the slab shown in Figure 1, illustrating the anchor construction.

Figure 3 is a perspective view ofa portion of the mold showing the anchor andremovable lugs in place thereupon before the casting of the slab.

Figure 4 is a sectional view through a portion of a. concrete slab through the anchoring device and through the removable lugs illustrating in dotted outline the method of removing these lugs.

Figure 5 is a sectional view through a concrete (Q1111 {or cast ng concrete wall facings with "cast to serve their purpose. These slabs are ordinarily several square feet in area and from one and one-half to three and one-half inches in thickness. trated in Figure 1, as it is this portion of the slab with which the present invention is concerned.

The slab A is provided with a decorative front surface Iii of any desired type and a rear surface Only a small section of the slab is il1us- H. Embedded in the slab A, I provide a substantially U-shaped anchor B having opposed outwardly extending flanges l2 thereupon. The anchors B each include a central closing end i3, a pair of opposed sides it and outwardly extending flanges l2 projecting from the extremities of the sides M. The central portion i3 is designed to lie substantially flush with the rear surface ll of the slab A, while the sides H and flanges it extend into the body of the slab and are anchored in place thereby.

An elongated pocket or aperture it is provided which extends at substantially right angles to the anchor B between the sides It thereof. This recess or pocket l5 includes a pair of downwardly .and inwardly extending side walls in which are connected by a curved or arcua'ted surface l1.

Thus the central portion It of the anchors B bridge the pockets I5 and permit access to the rear side of the center portion it of the anchors. A central apei'ture I9 is provided in the center portion 13 of the anchor B, the purpose of which will be later described in detail.

In the formation of the pocket It and in embedding the anchor B in place, I employ the arrangement illustrated in Figure 3 of the drawing. In this construction I illustrate a form lug made up of a pair of lugs 20 arranged in abutting relationship to form a recess Hi. When the Figure! of the drawing, I disclose the lugs 2c in position in the slab A, while in dotted outline in this figure I disclose the lugs partially removed. Thelugs 20 are provided with a slightly rounded edge at the juncture between the arcuated surface 25 and the abutting end 29 so as to simplify the removal of the lugs 20.

In Figure 5 of the drawing, I disclose the manner in which'the anchors are used in the preparation of a concrete wall. The inner form wall 38 is erected in the usual manner and the outer form wall is made up of the slabs A, which are connected to the inner form wall in the manner illustrated. Anchor bolts 32 extend freely through the apertures i9 with sufiicient play to permit relative movement between the bolt and the anchor lock nuts 33 are provided on the bolt 82 and are tightened sufliciently to hold the slabs in place, but are sufficiently loose to permit relative movement between the bolt 82 and the anchor B. The anchor bolt 32 extends into a substantially frustro-conical nut 34 which has its large diameter end abutting the form wall 3i. The bolt 32 does not extend entirely through the nut 34 anda fastening bolt 35 is threaded into the nut from the large diameter end and extends through the form wall 3|, being secured by means of a nut 38. Thus the slabs A are held in proper relationship to the inner form wall to form an outer form wall and to provide a form within whichconcrete may be poured'.

The slabs A are preferably spaced by wedges or strips and the slab wall thus formed is rough 1y painted on the inside to prevent the concrete readily obtainable.

nails 22 which extend in slots 23 in opposed ends of the lugs 28. Each of the lugs 20 comprises a flat surface 24, which is designed to rest upon the mold if during the formation. of the slab, a

pair of side walls 25 forming opposite sides of the lugs, and a curved surface 23 which forms from leaking therethrough. The Ro kets or recesses I5 are then preferably filled with clay or some other inexpensive soft material which is Mud or wet clay has been used with good effect for this purpose. When the aperture or pockets M are filled concrete is poured between the inner form wall 3| and the slabs a, the clay preventing the concrete from filling the pockets Hi. When the concrete has set the wall is formed and it will be noted that while bolts 32 are firmly embedded in the concrete wall, they extend loosely through the anchor B and relative movement can take place between the slab and the well without any deleterious efiets. The bolts 35 may be removed and if desired the nuts 34 may be removed, leaving a conical aperture on the iimer side of the concrete wall and a nut of the usual shape may be threaded upon the end ofthe' anchor bolt 32.

Inthe foregoing description I have described the construction of the lugs when the slabs are case with the exposed surface uppermost. In some instances, these slabs are cast with their exposed surface downwardly against the base of the mold. In such an instance, the lugs 20 may be secured to a strip of wood, or the like, and .urged down into the concrete after it has been poured,

' thus becoming embedded in the rear surface of between the flat surface 26 and the abutting ends 29 of the lugs.

w These notches 21 e'ngage the opposite sides of the center portion iii of the anchor B and taper away from the anchor 'B the slab, which is in such a case uppermost in the mold.

In Figures 6 and '7 of the drawing, I disclose a modified form of construction in which a slightly different form of anchor is employed. The anchor in Figure 3, and when the concrete forming the slab has hardened the lugs 20 may be removed by tapping the same lightly with a hammer and pivoting the separate lugs out from beneath the central bridging portion it of the anchor B; In 1Q, In construction the anchor C is'formed of a C is-preferred where the slabs are used to face masonry walls or the like. These slabs C are preferably used in combination with a flat strip anchor, such as may be readily laid between the brick forming the inner wall. Such aflat anchor is provided with a hook end which hooks about the central portion of the anchor C.

ascents described the principles of construction and op- I eration of my slab anchor andmeans of embedprises a central portion 31 which forms the closed end of the U, and a pair of sides 34 which are in opposed relationship on opposite ends of the central portion 31,. Outwardly extending flanges I 40 are bent outwardly from the ends of the sides 39= to form a more secure anchor and to better embed the anchor C. 7

Between the sides 39 of the-anchor C, I provide a, pocket which is provided with a pair of opposed inwardly sloping side walls 42 and a curved or arcuated base wall 43. This pocket provides a recess behind the center portion 31 of the anchor. Each of the lugs 44 includesa flat surface 45 designed to engage against a surface of' the mold, include opposed sides corresponding to the sides 42 of the pocket or recess formed, and include an arcuate surface 8 which forms the arcuated base surface 43 of the pocket 4!. The lugs ll abut along the abutting edges 41 and notches 49' engage about the central portion 31 a of the anchor C; These notches I! are so shaped as to permit removal of the. lugs 44,- these lugs being shown in dotted outline in Figure 7 of the drawing in partially removed position.

In accordance with the patent statutes, I have ding the same, and while I have endeavored to set forth the best embodiment thereof, I desire to have it understood that this is only illustrative of a means of carrying out my invention :and that v obvious changes may be made within the scopeof the following claims without departing from the spirit of my invention. I claim:

1. A-mold device for attaching a substantially U-shaped anchor to a concrete slab, comprising a pair of abutting lugs designed to overlie the central portion of the U-shaped anchor, and means for attaching said lugs. to a mold surface in abutting relation, said lugs holding said anchor with the central portion thereof flush with a surface of the mold during the pouring process.

2. An a paratus for holding a substantially U-shaped anchor in a mold, said apparatus comprising a pair of abutting lugs designed to overlie the central portion of said anchor and to hold said central portion against a surface of a mold, and slots in said lugs designed to receive attaching means for attaching said lugs to said mold during the pouring process.

GEORGE J. SAFFERT. 

